GB-187?
One of my favorite bubbs with nano and certainly my go to of Chinese glass for straight clean hits.
You're looking at the one offered by yingmin5, right? This is the version I have.
Have an old D020-W (don't think this version available anymore) that is similar to the D020-D in can, but with different mouthpiece. GB-187 has larger chamber and smoother draw IMO. I don't have some of the other popular ones that look like they would do good with nano (FC-187 V2, FC-UFO), but can't imagine they would do better with nano. Maybe as good, but better would be tough.
I do usually prefer a sidecar mouthpiece on this type of bubbler - especially with the nano. But, after a bad experience with FC-187 V1 have just stuck with GB-187. Really says something that I usually reach for this instead of other sidecars I have.
Some are thrilled with GB-186, but I'd never use a double perc for vaping. Less is more! This can apply to water levels, too.